LeetCode 1904. The Number of Full Rounds You Have Played

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class Solution {
public:
    int numberOfRounds(string startTime, string finishTime) {
        int start = 60 * stoi(startTime.substr(0, 2)) + stoi(startTime.substr(3)),
            finish = 60 * stoi(finishTime.substr(0, 2)) + stoi(finishTime.substr(3));
        if (start > finish) finish += 60 * 24;
        return max(0, finish / 15 - (start + 14) / 15); // max(0, floor(finish / 15) - ceil(start / 15))
};